PARÇACIK BOYUTUNA BAĞLI FÜME SİLİKA BAZLI KESME İLE KALINLAŞAN AKIŞKANLARIN REOLOJİK DAVRANIŞI

Year 2018, , 665 - 671, 11.12.2018

Mehmet Fahri Saraç , Seçil Peker Kerim Yapıcı

https://doi.org/10.21923/jesd.447357

Abstract

Üç farklı ortalama parçacık boyutuna sahip (8, 12 ve 18nm) füme
silikaların PEG200 taban akışkanına dört farklı kütlesel fraksiyon aralığında
(%5, 10 ,15 ve 20) dağıtılması ile elde edilen süspansiyon akışkanların
reolojik (viskozite, kritik kesme hızı, depolama modülü ve kayıp modülleri)
davranışları incelenmiştir. Doğrusal ve doğrusal olmayan viskoelastik ölçümlerden
elde edilen bulgular da, kütlece %5 fraksiyonda hazırlanan süspansiyonların Newton
kuralına uyduğunu ayrıca artan fraksiyona bağlı olarak viskoziteninde arttığı
gözlemlenmiştir. Düşük kütlesel fraksiyonlarda nanoparçacık boyutu ile kaymadan
dolayı viskozite kalınlaşmasına etki ettiği gözlemlenirken, kütlesel fraksiyon
artışı ile bu etkinin azaldığı da görülmüştür. Ayrıca tüm parçacık boyutu ve fraksiyonlarda
depolama ve kayıp modulüslerinin salınım gerilimleri incelendiğinde
süspansiyonların viskoz davranış özelliği göstermiştir. Bu bulgular daha güçlü
ve hafif kesme ile kalınlaşan süspansiyonların hazırlanmasını ve balistik
esaslı çalışmalarda kullanılması açısından önem arz etmektedir. 

Keywords

Füme silika, Nanoakışkan, Reoloji, Polietilen glikol

RHEOLOGICAL BEHAVIOR OF PARTICLE SIZE DEPENDENT FUMED SILICA BASED SHEAR THICKENING FLUIDS

Abstract

The rheological properties (viscosity, critical shear
rate, storage modulus and loss modulus) of suspension fluids produced by
dispersing fume silicates with three different mean particle sizes (8, 12 and
18 nm) in PEG200 base fluid at four different fractional ranges (5, 10, 15 and 20%)
were investigated. In the findings obtained from linear and nonlinear
viscoelastic measurements, it was observed that the suspensions prepared in 5%
fraction increased in viscosity due to increasing fraction. It is observed that
in low mass fractions the nanoparticle size affects the viscosity thickening
due to the slip, this effect leads to be reduced by the increase of the mass
fraction. Furthermore, when the storage modulus / loss modulus vs strain in all
particle sizes and fractions were examined, it was observed that for all
suspensions have viscous behavior characteristics. This findings are important
for the preparation of suspensions with stronger and light-weight shear
thickening fluids and for use in ballistic related works. 

Keywords

Fumed silica, Polyethylene glycol, Nanofluid, Rheology

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